Journal
OPTICS EXPRESS
Volume 17, Issue 2, Pages 924-932Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.000924
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Funding
- Israeli Science Foundation
- Israeli Ministry of Science, Culture and Sport
- Peter Brojde Center
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We propose and analyze a plasmonic lens that is illuminated by a radially polarized light. The lens is made of a coax-like geometry consisting of an annular dielectric slit surrounded by metal. Focusing efficiency is enhanced by the use of a circular grating assisting the coupling of light into surface plasmons. Further enhancement is obtained by introducing a circular Bragg grating on top of the structure, reflecting the surface plasmon modes that are propagating in the counter-focus direction. Using the Finite-Difference Time-Domain approach we investigate the transmission and the focusing mechanisms, and study the effect of structural parameters on the performance of the plasmonic lens. (C) 2009 Optical Society of America
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